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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
d66bea57 TG |
2 | #ifndef _ACPI_PMTMR_H_ |
3 | #define _ACPI_PMTMR_H_ | |
4 | ||
5 | #include <linux/clocksource.h> | |
6 | ||
7 | /* Number of PMTMR ticks expected during calibration run */ | |
8 | #define PMTMR_TICKS_PER_SEC 3579545 | |
9 | ||
10 | /* limit it to 24 bits */ | |
11 | #define ACPI_PM_MASK CLOCKSOURCE_MASK(24) | |
12 | ||
13 | /* Overrun value */ | |
14 | #define ACPI_PM_OVRRUN (1<<24) | |
15 | ||
16 | #ifdef CONFIG_X86_PM_TIMER | |
17 | ||
18 | extern u32 acpi_pm_read_verified(void); | |
19 | extern u32 pmtmr_ioport; | |
20 | ||
21 | static inline u32 acpi_pm_read_early(void) | |
22 | { | |
23 | if (!pmtmr_ioport) | |
24 | return 0; | |
25 | /* mask the output to 24 bits */ | |
26 | return acpi_pm_read_verified() & ACPI_PM_MASK; | |
27 | } | |
28 | ||
29 | #else | |
30 | ||
31 | static inline u32 acpi_pm_read_early(void) | |
32 | { | |
33 | return 0; | |
34 | } | |
35 | ||
36 | #endif | |
37 | ||
38 | #endif | |
39 |